The X-ray source population of the Orion Nebula Cluster

Details The X-ray source population of the Orion Nebula Cluster The X-ray source population of the Orion Nebula Cluster

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001tysc.confe.142f&link_type=abstract

Two Years of Science with Chandra, Abstracts from the Symposium held in Washington, DC, 5-7 September, 2001, meeting abstract.

Computer Science

Normal Stars And White Dwarfs

Scientific paper

The Orion Nebula Cluster (ONC, Ori OB Id association) which ionizes the Orion Nebula HII region was imaged in two exposures totalling 83 ks with the ACIS-I detector during the first year of the Chandra mission. This is the richest field of X-ray point sources in the sky with 1075 sources detected. Nearly all are pre-main sequence members of the ONC with masses ranging from 50 to 0.05 Msolar and ages from 105 to 107 yrs. We provide here an overview of the X-ray source population with selected results such as: the unusual flat log N-log S distribution, the absence of a relationship between X-rays and rotation, the common presence of very hard spectral components (kT = 5 to >10 keV) and narrow spectral features, emission from deeply embedded protostellar sources, the relationship of X-ray with stellar mass, and the wide dispersion of luminosities from higher mass stars.

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